Garage conversion rules in Davidson County, TN — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Converting a garage to living space in Davidson County requires a building permit. Converting to a DADU requires a contractor permit (no self-permitting). The space must meet all IRC habitability requirements.
A building permit is required throughout Davidson County before converting any accessory space (garage, basement, attic) to habitable use. For detached garage-to-DADU conversions, a licensed contractor must pull the permit — property owners may not self-permit. The conversion must meet all 2018 IRC requirements for habitable space: minimum 7-foot ceiling height in most areas, egress windows, insulation, HVAC, plumbing, and electrical. DADU standards apply: maximum 700–850 sq ft, subordinate to primary structure, 5-foot setbacks. In historic overlays, a covenant must be recorded before permits are issued. Garage-to-DADU conversions may not be rented short-term.
Unpermitted conversion: stop-work order + potential removal order. Self-permitted DADU: permit voided.
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See how Davidson County's garage conversions rules stack up against other locations.
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